Ward, Ralph D.
21st century corporate board
John Wiley & Sons, 1997
Buku Teks
Yablonsky, Lewis
Juvenile delinquency into the 21st century
Wadsworth, 2000
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Nugent William R.
Practice Evaluation for the 21st Century
Thomson Learning, 2001
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Che, Yuming
Chinese enterprises in the 21st century
Foreign Language Press, 2008
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21st century sustainable homes
Images Publishing Group, 2011
Buku Referensi